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-rw-r--r--src/mesa/swrast/s_depth.c81
1 files changed, 75 insertions, 6 deletions
diff --git a/src/mesa/swrast/s_depth.c b/src/mesa/swrast/s_depth.c
index 09c0be68f07..cedc7fdf129 100644
--- a/src/mesa/swrast/s_depth.c
+++ b/src/mesa/swrast/s_depth.c
@@ -26,6 +26,7 @@
#include "main/glheader.h"
#include "main/context.h"
#include "main/formats.h"
+#include "main/format_unpack.h"
#include "main/format_pack.h"
#include "main/macros.h"
#include "main/imports.h"
@@ -548,6 +549,74 @@ _swrast_depth_clamp_span( struct gl_context *ctx, SWspan *span )
}
+/**
+ * Get array of 16-bit z values from the depth buffer. With clipping.
+ */
+static void
+get_z16_values(struct gl_context *ctx, struct gl_renderbuffer *rb,
+ GLuint count, const GLint x[], const GLint y[],
+ GLushort zbuffer[])
+{
+ const GLint w = rb->Width, h = rb->Height;
+ const GLubyte *map = (const GLubyte *) rb->Data;
+ GLuint i;
+
+ if (rb->Format == MESA_FORMAT_Z16) {
+ const GLuint rowStride = rb->RowStride * 2;
+ for (i = 0; i < count; i++) {
+ if (x[i] >= 0 && y[i] >= 0 && x[i] < w && y[i] < h) {
+ zbuffer[i] = *((GLushort *) (map + y[i] * rowStride + x[i] * 2));
+ }
+ }
+ }
+ else {
+ const GLuint bpp = _mesa_get_format_bytes(rb->Format);
+ const GLuint rowStride = rb->RowStride * bpp;
+ for (i = 0; i < count; i++) {
+ if (x[i] >= 0 && y[i] >= 0 && x[i] < w && y[i] < h) {
+ GLuint d32;
+ const GLubyte *src = map + y[i] * rowStride + x[i] * bpp;
+ _mesa_unpack_uint_z_row(rb->Format, 1, src, &d32);
+ zbuffer[i] = d32 >> 16;
+ }
+ }
+ }
+}
+
+
+/**
+ * Get array of 32-bit z values from the depth buffer. With clipping.
+ */
+static void
+get_z32_values(struct gl_context *ctx, struct gl_renderbuffer *rb,
+ GLuint count, const GLint x[], const GLint y[],
+ GLuint zbuffer[])
+{
+ const GLint w = rb->Width, h = rb->Height;
+ const GLubyte *map = (const GLubyte *) rb->Data;
+ GLuint i;
+
+ if (rb->Format == MESA_FORMAT_Z32) {
+ const GLuint rowStride = rb->RowStride * 4;
+ for (i = 0; i < count; i++) {
+ if (x[i] >= 0 && y[i] >= 0 && x[i] < w && y[i] < h) {
+ zbuffer[i] = *((GLuint *) (map + y[i] * rowStride + x[i] * 4));
+ }
+ }
+ }
+ else {
+ const GLuint bpp = _mesa_get_format_bytes(rb->Format);
+ const GLuint rowStride = rb->RowStride * bpp;
+ for (i = 0; i < count; i++) {
+ if (x[i] >= 0 && y[i] >= 0 && x[i] < w && y[i] < h) {
+ const GLubyte *src = map + y[i] * rowStride+ x[i] * bpp;
+ _mesa_unpack_uint_z_row(rb->Format, 1, src, &zbuffer[i]);
+ }
+ }
+ }
+}
+
+
/*
* Apply depth test to span of fragments.
@@ -1129,14 +1198,14 @@ depth_test_pixels( struct gl_context *ctx, SWspan *span )
/* read depth values from buffer, test, write back */
if (rb->DataType == GL_UNSIGNED_SHORT) {
GLushort zbuffer[MAX_WIDTH];
- _swrast_get_values(ctx, rb, count, x, y, zbuffer, sizeof(GLushort));
+ get_z16_values(ctx, rb, count, x, y, zbuffer);
depth_test_span16(ctx, count, zbuffer, z, mask);
rb->PutValues(ctx, rb, count, x, y, zbuffer, mask);
}
else {
GLuint zbuffer[MAX_WIDTH];
ASSERT(rb->DataType == GL_UNSIGNED_INT);
- _swrast_get_values(ctx, rb, count, x, y, zbuffer, sizeof(GLuint));
+ get_z32_values(ctx, rb, count, x, y, zbuffer);
depth_test_span32(ctx, count, zbuffer, z, mask);
rb->PutValues(ctx, rb, count, x, y, zbuffer, mask);
}
@@ -1183,8 +1252,8 @@ _swrast_depth_bounds_test( struct gl_context *ctx, SWspan *span )
/* get 16-bit values */
GLushort zbuffer16[MAX_WIDTH], *zbuffer;
if (span->arrayMask & SPAN_XY) {
- _swrast_get_values(ctx, rb, count, span->array->x, span->array->y,
- zbuffer16, sizeof(GLushort));
+ get_z16_values(ctx, rb, count, span->array->x, span->array->y,
+ zbuffer16);
zbuffer = zbuffer16;
}
else {
@@ -1211,8 +1280,8 @@ _swrast_depth_bounds_test( struct gl_context *ctx, SWspan *span )
GLuint zbuffer32[MAX_WIDTH], *zbuffer;
ASSERT(rb->DataType == GL_UNSIGNED_INT);
if (span->arrayMask & SPAN_XY) {
- _swrast_get_values(ctx, rb, count, span->array->x, span->array->y,
- zbuffer32, sizeof(GLuint));
+ get_z32_values(ctx, rb, count, span->array->x, span->array->y,
+ zbuffer32);
zbuffer = zbuffer32;
}
else {